For validation, a good agreement has been clearly seen between the simulation and the experimental results of the temperatures at the 5 different points (T1–T4, and Tth), as depicted in Fig. 7
There was a difference between the simulation and the experimental results because of the model assumption that treats convection heat transfer coefficient as a constant. However, the convection heat transfer coefficient actually varies with temperature, and the temperature varies with position. As the film temperature is higher, the convection heat transfer coefficient increases.
Therefore, the difference between the value of actual convection heat transfer coefficient and the constant one is larger at the higher temperatures, and so does the discrepancy between the simulation and experimental results.